Software Engineer III (Full Stack / .NET + React)OverviewWe are seeking an experienced Software Engineer III to design, develop, and deliver scalable, high-performing solutions as part of a modern engineering team. This role combines strong backend .NET expertise with advanced frontend development in React, and includes mentorship, architectural input, and ownership of key system components.
Key Responsibilities- Design, develop, and implement scalable software solutions and new product features
- Build and enhance large-scale React-based applications and strategic platform initiatives
- Participate in the full Software Development Life Cycle (SDLC): design, development, testing, and deployment
- Translate business and functional requirements into technical solutions
- Contribute to architectural discussions and influence technical direction
- Develop high-quality frontend components with a focus on performance and usability
- Improve system performance, scalability, and reliability while reducing operational overhead
- Own and deliver complete components or features within applications
- Collaborate with distributed engineering teams to determine optimal technical solutions
- Design solutions in ambiguoproblem spaces and define system interactions
- Establish and promote engineering best practices, standards, and technologies
- Mentor junior developers and support team growth
- Track issues through resolution and provide regular updates to leadership
- Perform code reviews and contribute to design reviews across projects
- Provide project estimates, task breakdowns, and risk assessments
- Identify long-term architectural improvements and technical debt
- Occasionally serve in a Team Lead capacity
- Act as a subject matter expert for assigned applications
- Continuously improve development processes and team effectiveness
Required Technical SkillsCore Technologies:- .NET / .NET Core
- C#
- ASP.NET / MVC architecture
- REST APIs
- React
- JavaScript / TypeScript
- SQL Server
- Microservices architecture
Additional Technologies:- MongoDB, PostgreSQL
- Redis or caching solutions
- CI/CD tools (Jenkins or equivalent)
- Git-based source control (GitHub, GitLab, etc.)
- Terraform, Ansible (nice to have)
- Cloud platforms (AWS, Azure, or Google Cloud Platform) - preferred
Required Qualifications- 7+ years of software development experience with a focus on .NET technologies
- Strong proficiency in C# and .NET / .NET Core
- Experience with ASP.NET and MVC design patterns
- Expertise in building single-page applications (SPA)
- Experience developing and consuming RESTful and/or RPC APIs
- Advanced React experience (components, routing, state management)
- Strong knowledge of web technologies (HTML5, CSS3, JavaScript/TypeScript)
- Experience building microservices-based architectures
- Strong experience with relational databases (SQL Server, PostgreSQL)
- Experience with NoSQL solutions (MongoDB) and caching tools (Redis)
- Experience with CI/CD pipelines and automated deployments
Soft Skills & Competencies- Strong analytical and problem-solving skills
- Excellent verbal and written communication skills
- High attention to detail and accuracy
- Ability to manage multiple priorities in a fast-paced environment
- Strong collaboration skills across distributed teams
- Ability to adapt to changing priorities and deadlines
Work Environment & Expectations- Ability to manage multiple concurrent tasks and deadlines
- Strong focus and attention to detail for extended periods
- Effective decision-making and problem resolution under pressure
- Comfortable working in dynamic, evolving technical environments
Job Type & LocationThis is a Contract position based out of Lenexa, KS.
Pay and BenefitsThe pay range for this position is $105.55 - $112.50/hr.
Eligibility requirements apply to some benefits and may depend on your job classification and length of employment. Benefits are subject to change and may be subject to specific elections, plan, or program terms. If eligible, the benefits available for this temporary role may include the following:
Medical, dental & vision
Critical Illness, Accident, and Hospital
401(k) Retirement Plan - Pre-tax and Roth post-tax contributions available
Life Insurance (Voluntary Life & AD&D for the employee and dependents)
Short and long-term disability
Health Spending Account (HSA)
Transportation benefits
Employee Assistance Program
Time Off/Leave (PTO, Vacation or Sick Leave)
Workplace TypeThis is a fully onsite position in Lenexa,KS.
Application DeadlineThis position is anticipated to close on May 8, 2026.
>About TEKsystems:
We're partners in transformation. We help clients activate ideas and solutions to take advantage of a new world of opportunity. We are a team of 80,000 strong, working with over 6,000 clients, including 80% of the Fortune 500, across North America, Europe and Asia. As an industry leader in Full-Stack Technology Services, Talent Services, and real-world application, we work with progressive leaders to drive change. That's the power of true partnership. TEKsystems is an Allegis Group company.
The company is an equal opportunity employer and will consider all applications without regards to race, sex, age, color, religion, national origin, veteran status, disability, sexual orientation, gender identity, genetic information or any characteristic protected by law.
About TEKsystems and TEKsystems Global Services We're a leading provider of business and technology services. We accelerate business transformation for our customers. Our expertise in strategy, design, execution and operations unlocks business value through a range of solutions. We're a team of 80,000 strong, working with over 6,000 customers, including 80% of the Fortune 500 across North America, Europe and Asia, who partner with us for our scale, full-stack capabilities and speed. We're strategic thinkers, hands-on collaborators, helping customers capitalize on change and master the momentum of technology. We're building tomorrow by delivering business outcomes and making positive impacts in our global communities. TEKsystems and TEKsystems Global Services are Allegis Group companies. Learn more at TEKsystems.com.
The company is an equal opportunity employer and will consider all applications without regard to race, sex, age, color, religion, national origin, veteran status, disability, sexual orientation, gender identity, genetic information or any characteristic protected by law.
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